for OccupationalSafetyandHealth. www.necenter.org. [2019-06-25]. (原始内容存档于2020-10-22). Krah J, Unger RL. The Importance of OccupationalSafetyand Health:
Fentanyl: Emergency Response Database. National Institute for OccupationalSafetyandHealth (页面存档备份,存于互联网档案馆) U.S. National Library of Medicine: Drug Information